I took a look at how people are doing to get a gauge on difficulty level. I still have some more processing to do, but I thought I'd share what I have found so far:
Wizard Survival Rate: 49.6%
Dungeons Started with Wizard: 272
Dungeons Completed with Wizard: 135
Warrior Survival Rate: 50.0%
Dungeons Started with Warrior: 46
Dungeons Completed with Warrior: 23
Rogue Survival Rate: 66.6%
Dungeons Started with Rogue: 54
Dungeons Completed with Rogue: 36
Two interesting things start to surface.
First, most people are playing wizards. I started a discussion on the message boards about this:
http://steamcommunity.com/app/332540/discussions/0/2592234299562055393/
Second, rogues appear overpowered. I'm not going to jump to conclusions just yet, I'm going to collect more data. But there may need to be some balance adjustments for rogues.